RECORD: Darwin, C. R. & Emma Darwin. 1873.10.31-.11.03. Milk. CUL-DAR56.129. Edited by John van Wyhe (Darwin Online, http://darwin-online.org.uk/)
REVISION HISTORY: Transcribed by Christine Chua and edited by John van Wyhe 2.2023. RN1
NOTE: See record in the Darwin Online manuscript catalogue, enter its Identifier here. Reproduced with permission of the Syndics of Cambridge University Library and William Huxley Darwin. The volumes CUL-DAR 54-61 contain material for Darwin's book Insectivorous plants (1875).
[129]
Milk. (Keep for Digestion)
Oct 31 1873 Leaves pale & small in hothouse; put on Sti (Matches) small drops of milk at 8˚. 10' A.m. & a rather larger drop on one leaf. I did not look for 3/4h, but then I found milk coagulated on all 3, with some inflection of the tentacles
At 4 p.m. after 8h great inflection, with the laminæ of 2 much inflected with [much less]
Digestion
Nov 1st 8. a.m. laminæ of all 3 closely inflected: I can see a very little curds on the disk round some of the central tentacles. The leaf on which a good-sized drop was placed has secreted so copiously that the sec. which is most strongly acid, has run down on the moss below; which I never saw before. Case just like Casein Coloured litmus dark red.
[129v]
Nov. 2d. 8˚ one leaf almost open, a mer trace of curds on disc beneath the glands & so out of their influence: the 2d with only a trace betwen inflected tentacles: the third leaf to which much was given still secreting largely, so as almost to overflow with a good deal of curds. — secretion intensely acid (taste it)
Nov. 3d 8˚ on the 2 leaves on which 3 or 4 small drops were placed with pins' head, a mere vestige of curds left— on other leaf on which large drop was placed a good deal more curd left. I can see segregation in this leaf which is beginning to half expanded; the 2 other leaves fully expanded— so that inflection does not last nearly nearly so long as with casein. — (aft 3 days expanded)
Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (http://darwin-online.org.uk/)
File last updated 14 May, 2023